Q1: Is function cmp_char suppose to recognize that uppercase letter is equal to
    lowercase letter (e.g m and M)?
Q2: Is Madam a palindrome?
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Q1: Is function cmp_char suppose to recognize that uppercase letter is equal to
    lowercase letter (e.g m and M)?

A1: NO
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Q2: Is Madam a palindrome?

A2: NO
MadaM is a palindrome
Madam is NOT a palindrome
MAdam is NOT a palindrome
Therefore case sensitive
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